In this research, my problem is what the major criteria of Supreme Bliss in al-Ghazali's Thought are. The methodology in this investigation is analytic-descriptive. In his works, al-Ghazali offers different criteria, such as knowing God, Proximity to Him, meeting Him, to love Him and so on. To actualize the last one, al-Ghazali suggests two methods: one: interruption of concern with mundane world and abandoning any love but love to Him, and the other is to increase the knowledge of God. He, also, believes that the supreme bliss, theoretically speaking, is to discover Divine Glory and, practically, to have good beliefs and morals. I think that, al-Ghazali’scriteria are not exclusive, but they are compatible.